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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2718eb2809c258bc3e51cf87f8dcaac0c934c1424bf9980aaf0d1bf882f2db' 
  AND token = 'coccYi2sojaZlSTWhrEAXq8+HBngYaWh2ge5sniynMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}